Type-writing machine.



No. 630.!2I. PatentedAu'g l, I899; E. S. SHIMER.

TYPE WRITING MACHINE.

(Application filed Feb. 10, 1899) (mg Model.) y 2 Sheets-Sheet I.

WITNESSES. INVENTOH m: Nam-s PETERS co. vnmo-umm WASHINGTON, n. c.

Patented Aug. I, I899. E. S. SHIMEB.

TYPE WRITING MACHINE.

(Application filed Feb. 10, 1899.)

2 Sheets-Sheet 2.

No Model.)

UNTTTD STAT S PATENT Orricn.

ELMER S. SHIMER, OF MILTON, PENNSYLVANIA.

TYPE-WRITING MACHINE.

SPECIFICATION forming part of Letters Patent No. 630,121, dated August1, 1899. Application filed February 10, 1899. Serial No. 705,179. (Nomodel.)

To all whom it 71mg concern:

Be it known that I, ELMER S. SHIMER, a citizen of the United States,residing at Milton, in the county of Northumberland and State ofPennsylvania, have invented new and useful Improvements in'lype-YVriting Machines, of which the following is a specification.

My invention relates to the escapement mechanism for type-writingmachines whereby the paper-carriage is fed forward the distance of aletter-space at each depression and elevation of a key.

The object of the invention is to provide an improved construction ofthe same by which the carriage is fed by a light touch and a quickaction and the machine otherwise rendered more efficient in use.

The invention consists in the novel construction and combination ofparts hereinafter fully described and claimed.

In the accompanying drawings, Figure 1 is a plan view of so much of atype-writing machine as is necessary to illustrate my invention. Fig. 2is a longitudinal section of the same on the line m 00, Fig. 1. Fig. 3is a detail perspective view of the escapement mechanism. Fig. i is aplan view of the fixed es.- capernent-wheel detached. Fig. 5 is asimilar View of the loose escapement-wheel. Fig. 6 is a longitudinalsectional view of the loose cog-wheel and ratchet at the upper end ofthe spacer-shaft. Fig. 7 is a similar view of the fixed and looseescapement-wheels. Fig. 8 is a detail sectional elevation of therock-shaft at the rear of the machine.

In the said drawings the reference-numeral 1 designates the frame of themachine, 2 the paper-carriage, 3 the traverse-rail thereof, and 4 thepivoted spacer rack-bar, all of which may be of any ordinary or suitableconstruction.

Located centrally in the rear of the machine is anintermittently-rotatable spacer-shaft 5, provided at the upper end witha hub 7, formed with a circular flange or collar 8 intermediate itsends. This hub is secured to the shaft by a set-screw passing throughthe lower portion thereof. The said hub in its upper side or face isformed with a screwthreaded hole and is also provided with a pin or stud9. Fitting on the upper end of said hub and supported by the flange orcollar is are held in place by set-screws.

a loose cog-wheel 10, having a circular ratchet 12 on its upper side orface. Secured to said hub by a set-screw 13, passing through a holetherein and engaging with the screw threaded hole in the hub, is aspring-pawl 11, which engages with said ratchet. The pin or stud 9engages with a hole in said pawl. This construction is shown anddescribed in an application for patent filed by me on the 28th day ofOctober, 1898, Serial No. 694,765, and no claim is made thereto in thepresent application. Secured to said spacer-shaft, near the lower endthereof, by means of a set-screw 14:, is an escapernent-wheel 15, formedwith two opposite slots 16 and with an elongated opening 17. Secured tothis Wheel is one end of a coiled spring 18, the other end of which issecured to a loose escapement-wheel 19, located below the same andjournalcd on said shaft. This wheel is formed with an opening 20,coinciding with the opening 17, the object of these openings being toaccommodate the said spring. Secured to said wheel 19 are twoupwardly-extending headed screws 21, which pass through the slots 16,which are slightly larger than the shanks of the screws, so as to allowsaid wheels to have an alternate intermittent movement for feeding thepapercarriage to make the letter-space, as hereinafter described. Thesaid screws and slots bear such a relation to each other and to thewheels that as a key is depressed the loose wheel will. move a distance.a fraction less than the fixed wheel and will complete its stroke whenthe key is released, at which time the fixed wheel and its shaft willmove a distance equal to a letter-space, the movement of the shaft beingeffected through the inedium of the ordinary carriage-driving spring.

Located at the rear of the machine is a rockshaft 24, which is held inplace by bearings 23, passing through lugs 22, secured to the frame ofthe machine. These bearings consist of pins, which are pointed andengage with recesses in the ends of the said shaft and This shaft isprovided with a crank-arm 25, which is pivotally connected with theletter-space lever 26, which is adapted to be reciprocated by thedepression and release of a key (not shown) in the usual manner.Embracing this rockshaft is a coiled spring 27, one end of which isconnected with said shaft and the other to the frame of the machine andis for the purpose of returning the shaft to normal position. Secured toor formed with said shaft is a dog 28, which is adapted to alternatelyengage tension of the spring 18 will move the said wheel a distance afraction less than a letterspace, when the screws 21 will come incontact with the ends of the slots in the fixed wheel, which will checkthe movement of the loose Wheel. While this operation is taking placethe dog will engage with the fixed wheel v and hold it while theimpression is being made. Upon the release of the key the dog will bereturned to normal position, being thrown out of engagement with thefixed wheel, which will move the distance of a complete letter-space,and as the fixed wheel nears the completion of its stroke the rear oropposite ends of the slots will en gage with the pins, so that the loosewheel will move with the fixed wheel, and thus complete its stroke.

From the above it will be seen that the loose wheel upon the depressionof a key will be rotated a distance slightly less than a completeletter-space, and upon the return of the key the fixed wheel will movethe distance of a letter-space and the loose wheel move forward tocomplete its stroke.

The object of giving the divided movement to the lower or looseescapement-wheel is to allow the two escapement-wheels to be locatedvery close to each other, so that the oscillating dog will have to makebut a very slight movement, and at the same time to give the necessaryclearance to the dog, so as to prevent interference with the tooth ofthe loose escapement-wheel when the key is released. It will be notedthat when the key is depressed the loose escapement-wheel will not bemoved a complete'letter-space, so that the next tooth will be slightlyin rear of the tooth of the fixed wheel with which the dog engages. Bythis means there will be no liability of the dog striking the tooth ofthe loose wheel when the'key is released until the latter is out ofcomplete engagement with the fixed wheel, thus insuring greater accuracyin the letterspacing. If the two escapement-Wheels moved acompleteletter-space at each depression and release of the key, there would beliability of the next toot-h of the loose wheel moving past the tooth ofthe fixed wheel with which the dog engages, and thus prevent the latterfrom being depressed upon the release of the key. This divided movementof the loose or holdin g wheel is effected through the proportionalrelation and location of the slots and pins or screws. It also lessensthe noise and tension of the machine.

Having thus fully described my invention, what I claim is 1. In atype-writing machine, the combina tion with the letter-space shaft, theletterspace rack-bar and the connections between the same, of therotatable escapement-wheel secured to said shaft, the looseescapementwheel mounted on said shaft and the connections between saidwheels whereby they are alternately and intermittently rotated and alsorotated simultaneously or in unison, substantially as described.

2. In a type-writing machine, the combination with the letter-spaceshaft, the letterspace rack-bar and the connections between the same, ofthe alternately-rotatable fixed and loose escapement-wheels mounted onsaid shaft, one of which is formed with a slot and the other providedwith a pin or screw engaging therewith, the spring connecting saidwheels, and the oscillating dog, said slot and pin being so proportionedwith respect to each other and to the wheels, that said wheels areadapted to be alternately and intermittently rotated and also to berotated simultaneously, substantially as described.

3. In a type-writing machine, the combina .tion with the letter-spaceshaft and means for rotating the same, of the fixed and loose es=capement-wheels mounted on said shaft, one of which is provided with aslot and the other with a pin engaging therewith, the spring connectingsaid wheels, and the oscillating dog, the construction being such thatupon the depression of a key the dog will be thrown out of engagementwith the loose wheel allowing it to turn a part of the distance of aletterspace, and into engagement with the fixed wheel, and when said keyis released the fixed wheel turns the distance of a letter-space and theloose Wheel turns to complete its stroke, substantially as described.

4:. In a type-writing machine, the combination with theletter-spaceshaft, the loose cogwheel at the upper end thereof, the ratchet securedthereto or formed therewith, the spring-pawl secured to said shaft, andthe spacer rack-bar, of the fixed and loose escapement-wheels, one ofwhich is formed with a slot and the other with a pin, the springconnecting said escapement-wheels, and the 0s cillating dog, the saidslot and pin being so proportioned that said wheels are adapted toalternately and intermittently rotate and also to rotate simultaneouslyor in unison, substantially as described.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

ELMER S. Sl-IIMER.

WVitnesses:

J 0s. ANGS'IADT, H. E. ANGSTADT.

